放射治疗的主要目的是最大限度地控制肿瘤,同时避免正常组织的损伤。许多放疗学者为此而探索运用时间分割剂量因素设计新的治疗计划。Ellis氏提出的名义标准剂量(NSD)常被用于平衡不同的治疗计划。但许多动物和临床资料提示,NSD概念存在许多不足之处。最近临床放射生物学家试图根据线性—二次模式(即L-Q模式)阐述分割放射治疗中许多现象,似乎它较 The main purpose of radiation therapy is to maximize control of the tumor while avoiding damage to normal tissue. Many radiation therapists explore the use of time-division dose factors to design new treatment plans. Ellis’ nominal nominal dose (NSD) is often used to balance different treatment plans. However, many animal and clinical data suggest that there are many deficiencies in the concept of NSD. Recently, clinical radiobiologists tried to explain many phenomena in segmented radiotherapy based on the linear-quadratic model (L-Q model). It seems that